Introduction

Sensing and regulating N status is crucial for the efficient use of the metabolically expensive N2 fixing apparatus. It has been hypothesized that leguminous nitrogen fixation and indeed more general nitrogen acquisition in plants, is regulated by a feedback mechanism involving cycled, nitrogen-rich organic compounds (Cooper, Clarkson 1989; Parsons, Sunley 2001). Using Lotus japonicus as our model legume, we have observed some interesting changes in N2 fixation and N metabolism in plants with altered glutamine synthetase (GS) and arginase activities.

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